Locomotive-boiler furnace.



J. H. GROVE. LOUOMOTIVE BOILER FURNACE. APPLIOATION FILED 00119, 1908.

' Patented July 16, 1912.

2 SHEETS-SHEET ig-7162368. l'werufafi' Q M5 fig W J. H. GROVE. I ALOG'OMOTIVE BOILER FURNACE.

APPLICATION FILED 0GT.19, 1905.

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Patented July 16; 1912.

4 UNITED STATES PATENT FFIQLBZ,

JAMES H. GROVE, or OMAHA, NEBRASKA, AssIqNoR, BY ivrnsnnassrennnn rs,

TO AMERICAN ARCH COMPANY, or NEW YORKQN. 3., A conroaarzon or New YOBK.I

V Specification of LettersQPateng. Application filed October 19, 1908Serial No. 453,526.

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Patented July 16, 191 2.

To all whom it may concern l 3e it known that I, James H. GROVE, acitizen of the United States, and a residentof Omaha, Douglas county,Nebraska, have Invented certain new and useful Improve.

ments in Locomotive-Boiler Furnaces, of

; furnaces andhas special reference to improvements whereby suchfurnaces are adapted to the burning of lig'nite.

The object of my invention, specifically considered, is to provide meansfor battling or interrupting the flow of gases from the grate to thefines and causing the thorough admixture thereof in the firebox, andfurther', to at the same time, admit hot air and enforce the admixturethereof with the com bustibles in the firebox.

My invention consists generally in a loco motive boiler furnacecomprising a. firebox having a fine sheet at one end and a fuel door atthe other end, incombination with a refractory front arch-occupying aninclined positioniiifth e frontportion of the firebox between thefiue'sheet and the grate and a vertical or crown arch occupying the uppercentral portion of the firebox, above and back of the front arch; ,saidvertical or crown arch being provided with air pas- My invention will bemore readily understood by reference to the accompanying drawings"forming a part of this spec1hcation and in which Figure 1 is a verticalsection -.of a locomotive boiler furnaceembodying my invention, on theline Y- -Y of'Fig. 2. Fig. 2 is a plan view thereof, the crown sheet ofthe firebox being broken away to disclose the arches. Fig. 3 is avertical section on the line X X of Fig. 1. Fig. -L illustrates myinvention as applied to lireboxes of-the narrow 3 type As shown inthe-drawings 2 represents the shell of the boiler; 3 the tines; 4: theflue sheet; .5 the rear sheet of the firebox; (3 the door opening; 7 thefuel door which closes the opening; 8, 8 the sheets; 9 the crown"'shee't';'-10 the grate; and, 11 the arch supporting tubes.

A r epresentstlie front arch and B is the vertical or crown arch. Bothof these arches arecomposed of refractory material; in other words, eachis made up of a plurality ofrefractory bricks of suitable form,'supported by the arch tubes, 11. "The front arch is a so called solidarch, thatis, it is made up of imperforate b'ricks,'a. It extends fromtheflue sheet in a rear fard and upward direction and terminatessubstantially at the center of the firebox.

much as in its'lower portion it contains air fehannels or ducts, b andopenings, 5 wvhereby communication is established be,-

ween the air passages and the firebox. I These openings are arranged onthe bottom thimbles, 6 in the sides of the firebox. The upper portion ofthe crown arch, 'B, may be formedof solid brick.- At the'topof the archI prefer to notch orrece'ss' the bricks as shown at b" to reducetliearea of contact between the arch, B, and thecrown slr'e'etofthe'firebox. The opening, (1, between the upper end of the arch, A, andthe lower part of the arch, B,- is termed-- the throat of the furnace.'lhechamber, D,-above the arch, A,-is called the coi'ubustioncliau-iber; the space, F, below the arch, A, and back of "the arch, B,is termed the tircchamber.

The operation of my invention is as follows: A partial vacuum ordraft isproduced in the firebox by the action of the blower or exhaust nozzle,not shown, in the front end of the boiler. The burning gases thereforetend to flow direct from the bed of fuel on the grate to the lines orsmoke 1. '1 1 1. I 4 outlet, 3; This movement of the gases 15, however;interfered withand prevented by the arches A and B. The arch, A; causesthe gasesfrom the front end of the firebox to flow rearwardly toward thethroat, C, and the arch, B. The arch, B, serves to cut-off the directflow of gases from the rear end of the firebox to the front end thereofand chamber are caused to comingle beneath the throat, C. The vacuum 1nthe firebox causes air to rush through the passages 7) of the arch, B,and the air being therein heated is or lower edge of the arch."'. Tlieair is sup-. plied to the passages, 5 thIOllf h tubes or The arch, B,may be termed a hollow arch inasthus the gases from all parts of thefire.

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